:root{--max:1280px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}button,input{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}strong{font-weight:650}em{font-style:normal;color:var(--mint)}::selection{background:#325a51;color:var(--text)}
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:48px}.reading-progress{height:3px;position:fixed;top:0;left:0;right:0;z-index:100;background:transparent}.reading-progress span{display:block;height:100%;width:0;background:var(--mint);transition:width .08s linear}.skip-link{position:absolute;top:-100px;left:15px;background:var(--text);color:var(--bg);padding:8px 14px;z-index:200}.skip-link:focus{top:12px}
.brand-mark{display:inline-flex;width:37px;height:37px;border:1px solid var(--mint);border-radius:10px;align-items:center;justify-content:center;color:var(--mint);font-weight:750;letter-spacing:-3px;padding-right:3px;font-size:17px;line-height:1}.brand-mark span{color:var(--orange);padding-inline:3px}
.hero{min-height:660px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:6vw;align-items:center;padding-block:95px 85px}.eyebrow,.section-kicker,.chapter-number,.lab-label{font-size:11px;letter-spacing:.17em;font-weight:750;color:var(--mint)}.eyebrow{display:flex;align-items:center;gap:12px;margin:0 0 28px}.eyebrow-line{width:29px;height:1px;background:var(--mint)}h1,h2,h3,p{margin-top:0}h1,h2,h3{letter-spacing:-.046em;line-height:1.09}h1{font-size:clamp(3.8rem,5.7vw,6.1rem);font-weight:680;max-width:680px;margin-bottom:28px}h2{font-size:clamp(2.6rem,4.2vw,4.3rem);font-weight:660}h3{font-size:1.55rem;font-weight:650}.hero-lead{font-size:19px;line-height:1.58;max-width:610px;color:var(--body);margin-bottom:20px}.hero-note{font-size:14px;color:var(--muted);max-width:545px}.hero-actions{display:flex;align-items:center;gap:25px;margin-top:34px;flex-wrap:wrap}.button{border:1px solid transparent;border-radius:8px;padding:12px 17px;min-height:47px;display:inline-flex;align-items:center;gap:15px;font-size:13px;font-weight:700;line-height:1.2;transition:background .2s,transform .2s,border-color .2s}.button:hover{transform:translateY(-2px)}.button-primary{background:var(--mint);color:var(--body)}.button-primary:hover{background:#b0f0cf}.button-secondary{background:transparent;color:var(--text);border-color:var(--line)}.button-secondary:hover{border-color:var(--mint);background:#20332e}.text-link{font-size:13px;font-weight:650;color:var(--muted);display:inline-flex;gap:12px;align-items:center}.text-link:hover{color:var(--mint)}
.hero-visual{border:1px solid #3b4a53;border-radius:15px;background:radial-gradient(ellipse at 75% 0,#23453d55,transparent 48%),linear-gradient(145deg,#1c2630,#151b25 65%);box-shadow:0 26px 80px #0005;overflow:hidden;min-height:375px;display:flex;flex-direction:column;justify-content:space-between}.hero-visual-top,.hero-visual-bottom{display:flex;justify-content:space-between;gap:12px;padding:20px 25px;font-size:10px;letter-spacing:.11em;font-weight:700;color:var(--dim)}.hero-visual-top{border-bottom:1px solid #ffffff12}.live-dot{color:var(--mint);display:flex;align-items:center;gap:7px}.live-dot:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--mint);box-shadow:0 0 11px var(--mint)}.hero-visual-bottom{border-top:1px solid #ffffff12;letter-spacing:0;font-size:12px;font-weight:500;color:var(--muted)}.hero-chain{display:flex;align-items:center;justify-content:center;gap:8px;padding:35px 18px}.chain-item{border:1px solid #40505a;border-radius:10px;background:#101820b3;min-width:110px;min-height:134px;padding:13px;display:flex;flex-direction:column;justify-content:space-between}.chain-item strong{font-size:27px;letter-spacing:-.06em;color:var(--text);line-height:1}.chain-item small{font-size:10px;color:var(--muted)}.chain-count{font-size:9px;font-weight:750;letter-spacing:.08em;color:var(--dim)}.chain-item .unit{font-size:12px;letter-spacing:0;color:var(--muted);font-weight:500}.chain-item svg{width:100%;height:45px}.chain-item svg path{fill:none;stroke:var(--mint);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.chain-accent{border-color:#6da789;background:#20392e}.chain-accent strong{color:var(--mint)}.chain-arrow{font-size:21px;color:var(--dim)}
.journey{border-top:1px solid var(--line-soft);padding-block:60px 90px}.journey-intro{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:end;margin-bottom:36px}.journey h2{margin:14px 0 0;font-size:clamp(2.4rem,3.5vw,3.7rem)}.journey-intro p{color:var(--muted);font-size:16px;max-width:450px;margin-bottom:2px}.journey-list{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:9px}.journey-list li{min-width:0}.journey-list a{height:188px;border:1px solid var(--line);border-radius:10px;background:linear-gradient(160deg,#1b232e,#151b24);padding:18px;display:flex;flex-direction:column;position:relative;transition:transform .2s,border-color .2s,background .2s}.journey-list a:hover{transform:translateY(-4px);border-color:var(--mint);background:#1d2a30}.journey-list span{font-size:12px;color:var(--mint);font-weight:750;letter-spacing:.08em}.journey-list strong{font-size:18px;letter-spacing:-.025em;line-height:1.2;margin-top:auto;margin-bottom:6px}.journey-list small{font-size:12px;color:var(--muted);line-height:1.35;max-width:160px}.journey-list b{position:absolute;top:17px;right:17px;font-weight:400;color:var(--dim);font-size:16px}
.content-layout{display:grid;grid-template-columns:178px minmax(0,1fr);gap:68px;padding-bottom:110px}.side-rail{align-self:start;position:sticky;top:25px;padding-top:18px;display:flex;flex-direction:column;gap:5px}.side-rail p{font-size:10px;letter-spacing:.16em;color:var(--dim);font-weight:800;margin-bottom:15px}.side-rail a{font-size:11px;color:var(--dim);padding:10px 9px;border-left:1px solid var(--line);display:flex;gap:10px;line-height:1.3;transition:color .2s,border-color .2s,background .2s}.side-rail a span{font-size:12px}.side-rail a.active,.side-rail a:hover{color:var(--mint);border-left-color:var(--mint);background:#19271f}.side-rail-end{margin-top:9px}
.chapter{border-top:1px solid var(--line);padding:78px 0 92px;scroll-margin-top:70px}.chapter-head{max-width:810px}.chapter-head h2{max-width:800px;margin:18px 0 22px}.chapter-head>p{font-size:19px;line-height:1.57;color:var(--body);max-width:745px;margin-bottom:37px}.film-frame{margin:0 0 45px;border:1px solid var(--line);border-radius:11px;background:#090d14;padding:8px;overflow:hidden}.film-frame img{display:block;width:100%;height:auto;border-radius:5px;aspect-ratio:16/9;object-fit:cover}.film-frame figcaption{font-size:10px;font-weight:700;letter-spacing:.12em;color:var(--dim);padding:13px 11px 6px}.prose{max-width:760px;margin-bottom:43px;display:grid;grid-template-columns:1fr 1fr;gap:28px}.prose p{color:var(--body);font-size:16px;line-height:1.72;margin:0}.prose strong{color:var(--text)}
.lesson-goal{max-width:760px;margin:-17px 0 28px;border-left:2px solid var(--mint);padding:8px 0 8px 18px;color:var(--body);font-size:14px;line-height:1.6}.lesson-goal span{display:block;color:var(--mint);font-size:10px;font-weight:800;letter-spacing:.13em;margin-bottom:4px}.lesson-story{max-width:780px;margin:0 0 45px}.lesson-story section{margin:0 0 34px}.lesson-story h3{font-size:clamp(1.35rem,2vw,1.7rem);line-height:1.25;letter-spacing:-.035em;margin:0 0 14px}.lesson-story p{color:var(--body);font-size:16px;line-height:1.78;margin:0 0 15px}.lesson-story strong{color:var(--text)}.worked-example{border:1px solid var(--line);border-radius:10px;background:#151d27;padding:23px 24px;margin:5px 0 36px}.worked-example>span{display:block;color:var(--mint);font-size:10px;letter-spacing:.14em;font-weight:800}.worked-example h4{font-size:19px;line-height:1.25;letter-spacing:-.025em;margin:9px 0 17px}.trace-row{display:grid;grid-template-columns:minmax(74px,.7fr) minmax(0,2.5fr) minmax(95px,1fr);gap:12px;align-items:baseline;border-top:1px solid var(--line);padding:11px 0;font-size:13px}.trace-row:last-child{padding-bottom:0}.trace-row b{color:var(--muted);font-weight:600}.trace-row code{color:var(--body);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}.trace-row strong{color:var(--mint);font-size:12px;text-align:right}.self-check{max-width:780px;border:1px solid #41514b;border-radius:9px;background:#19241f;margin:0 0 22px;padding:0 20px}.self-check summary{cursor:pointer;color:var(--body);font-weight:650;font-size:14px;line-height:1.5;padding:17px 0}.self-check summary::marker{color:var(--mint)}.self-check p{border-top:1px solid #34443b;margin:0;padding:15px 0 17px;color:var(--body);font-size:14px;line-height:1.7}
.lab{border:1px solid #3a4652;border-radius:12px;background:linear-gradient(150deg,#1b2430,#171e29 55%,#17211f);padding:28px;margin-bottom:23px;box-shadow:0 16px 45px #0002}.lab-heading{display:flex;justify-content:space-between;gap:32px;align-items:end;border-bottom:1px solid var(--line);padding-bottom:21px}.lab-heading h3{margin:6px 0 0}.lab-heading p{max-width:325px;color:var(--muted);font-size:13px;line-height:1.5;margin:0}.lab-controls{padding:21px 0 25px;display:flex;flex-direction:column;gap:14px}.range-label{display:flex;justify-content:space-between;align-items:baseline;color:var(--body);font-size:13px;font-weight:600}.range-label output{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--mint);font-size:15px}.lab input[type=range]{width:100%;appearance:none;-webkit-appearance:none;background:transparent;margin:0;height:20px}.lab input[type=range]::-webkit-slider-runnable-track{height:4px;background:linear-gradient(90deg,#55756a,#617c8c);border-radius:4px}.lab input[type=range]::-moz-range-track{height:4px;background:linear-gradient(90deg,#55756a,#617c8c);border-radius:4px}.lab input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--mint);border:3px solid #1c2827;margin-top:-7px;box-shadow:0 0 0 1px var(--mint)}.lab input[type=range]::-moz-range-thumb{width:13px;height:13px;border-radius:50%;background:var(--mint);border:3px solid #1c2827;box-shadow:0 0 0 1px var(--mint)}.segmented{display:flex;flex-wrap:wrap;gap:6px}.segmented button{border:1px solid var(--line);background:#151c25;color:var(--muted);padding:8px 11px;border-radius:6px;font-size:12px;font-weight:650;transition:color .18s,border-color .18s,background .18s}.segmented button:hover,.segmented button:focus-visible{border-color:var(--mint);color:var(--text)}.segmented button.active{color:var(--body);background:var(--mint);border-color:var(--mint)}.lab-grid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(205px,.7fr);gap:15px}.chart,.readout{border:1px solid var(--line);border-radius:8px;background:#111822;min-width:0}.chart{padding:14px 16px 9px}.chart-head,.chart-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;color:var(--dim);font-size:9px;letter-spacing:.08em;font-weight:750}.chart-head{padding-bottom:4px}.chart-key{display:flex;align-items:center;gap:5px;color:var(--mint)}.chart-key i{height:6px;width:6px;border-radius:50%;background:var(--mint)}.chart svg{display:block;width:100%;height:auto;overflow:visible}.chart-foot{font-size:9px;letter-spacing:0;padding:0 3px 3px}.readout{padding:20px;display:flex;flex-direction:column}.readout-label{font-size:10px;color:var(--dim);font-weight:750;letter-spacing:.12em}.readout-main{display:flex;align-items:baseline;gap:9px;margin:14px 0 18px}.readout-main strong{font-size:55px;line-height:1;letter-spacing:-.08em;color:var(--mint);font-weight:650}.readout-main span{font-size:12px;color:var(--muted)}.readout-rows{border-top:1px solid var(--line);padding-top:11px;display:flex;flex-direction:column;gap:7px}.readout-rows>div{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px;line-height:1.4}.readout-rows b{color:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:600;white-space:nowrap}.readout p{margin:17px 0 0;color:var(--body);font-size:12px;line-height:1.55}.takeaway{background:#1b2824;border-left:2px solid var(--mint);padding:14px 19px;margin-bottom:16px;color:var(--body);font-size:13px;line-height:1.6}.takeaway span{display:block;color:var(--mint);font-size:10px;letter-spacing:.14em;font-weight:800;margin-bottom:3px}.formula{border-bottom:1px solid var(--line);max-width:810px}.formula summary{cursor:pointer;color:var(--muted);font-size:12px;font-weight:650;padding:14px 0;list-style:none}.formula summary::-webkit-details-marker{display:none}.formula summary::before{content:"+";display:inline-block;width:21px;color:var(--mint);font-size:17px;vertical-align:-1px}.formula[open] summary::before{content:"−"}.formula p{font-size:13px;color:var(--muted);margin:0 0 14px 21px;line-height:1.65}.formula code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--body);font-size:12px}
.handoff{display:grid;grid-template-columns:1fr 18px 1.35fr 18px 1.4fr 18px 1fr;gap:8px;align-items:stretch}.handoff-cell{min-width:0;background:#111822;border:1px solid var(--line);border-radius:8px;padding:14px 12px;display:flex;flex-direction:column;min-height:121px}.handoff-cell span{font-size:9px;letter-spacing:.1em;color:var(--dim);font-weight:750}.handoff-cell strong{font-size:31px;line-height:1;margin:auto 0 5px;letter-spacing:-.04em;color:var(--text);font-weight:650}.handoff-cell small{color:var(--muted);font-size:10px;line-height:1.2}.handoff-double>div{display:flex;gap:13px;margin:auto 0 5px}.handoff-double strong{margin:0;color:var(--orange)}.handoff-double strong+strong{color:var(--blue)}.handoff-highlight{border-color:#6d9f89;background:#1d332c}.handoff-highlight strong{color:var(--mint)}.handoff-arrow{display:flex;align-items:center;justify-content:center;color:var(--dim);font-size:19px}.lab-observation{font-size:13px;line-height:1.55;color:var(--body);margin:18px 0 0}.action-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.action-row .button{padding:9px 13px;min-height:39px;font-size:12px}.text-button{border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:650;padding:9px 12px}.text-button:hover{color:var(--mint)}button:disabled{opacity:.55;cursor:wait}.network-diagram{min-height:270px;background:#111822;border:1px solid var(--line);border-radius:8px;overflow:hidden}.network-diagram svg{display:block;width:100%;height:auto;min-height:265px}.network-caption{padding:17px 0 0;display:flex;align-items:baseline;gap:21px}.network-caption span{font-size:10px;letter-spacing:.12em;color:var(--mint);font-weight:800;white-space:nowrap}.network-caption p{font-size:13px;line-height:1.55;color:var(--body);margin:0}
.wave-note{font-size:10px;color:var(--muted);margin:0 0 4px 3px;line-height:1.4}.wave-note[hidden]{display:none}
.network-mobile-flow{display:none}
.recap{border-top:1px solid var(--line);padding:80px 0 30px;scroll-margin-top:70px}.recap h2{margin:18px 0 24px;max-width:670px}.recap>p{color:var(--body);max-width:760px;font-size:17px;line-height:1.7}.recap-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:37px 0}.recap-grid>div{border:1px solid var(--line);border-radius:9px;background:var(--panel);padding:25px}.recap-grid span{font-size:10px;color:var(--mint);letter-spacing:.15em;font-weight:750}.recap-grid strong{display:block;margin:17px 0 8px;font-size:21px;line-height:1.25;letter-spacing:-.025em}.recap-grid p{margin:0;font-size:13px;color:var(--muted);line-height:1.55}.recap-question{border-left:2px solid var(--orange);padding-left:19px;margin-bottom:30px}.recap-question em{color:var(--text);font-weight:600}
.site-footer{border-top:1px solid var(--line);padding-block:40px 60px;display:flex;justify-content:space-between;gap:40px}.site-footer>div{display:flex;align-items:flex-start;gap:13px}.site-footer p{color:var(--dim);font-size:12px;line-height:1.5;max-width:340px;margin:2px 0 0}.site-footer>p{text-align:right}
.overview-recap{max-width:1020px;padding-bottom:100px}.lesson-intro{display:flex;justify-content:space-between;gap:20px;align-items:center;padding-top:35px;padding-bottom:18px;color:var(--dim);font-size:11px;letter-spacing:.12em;font-weight:700}.back-link{color:var(--mint);letter-spacing:0;font-size:12px}.back-link:hover{text-decoration:underline}.lesson-pagination{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:35px}.lesson-pagination a{display:flex;flex-direction:column;gap:7px;border:1px solid var(--line);border-radius:9px;background:var(--panel);padding:20px;min-height:92px;transition:border-color .2s,transform .2s}.lesson-pagination a:hover{border-color:var(--mint);transform:translateY(-2px)}.lesson-pagination a:last-child{text-align:right}.lesson-pagination span{font-size:10px;color:var(--mint);letter-spacing:.12em;font-weight:750}.lesson-pagination strong{font-size:16px;line-height:1.2}.lesson-intro+.content-layout .chapter{padding-top:55px}
svg .grid-line{stroke:#2e3945;stroke-width:1}svg .axis-line{stroke:#66727d;stroke-width:1.2}svg .zero-line{stroke:#747985;stroke-width:1;stroke-dasharray:4 5}svg .plot-line{fill:none;stroke:var(--mint);stroke-width:3.5;stroke-linejoin:round;stroke-linecap:round}svg .component-line{fill:none;stroke-width:2;stroke-dasharray:6 6;stroke-linejoin:round;stroke-linecap:round;opacity:.65}svg .plot-dot{fill:var(--mint);stroke:#14211d;stroke-width:4}svg .guide-line{stroke:#d4e8dd;stroke-width:1;stroke-dasharray:4 5;opacity:.45}svg text{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;fill:#8794a0}svg .diagram-label{font-size:12px;fill:#a9b9c4}svg .diagram-value{font-size:22px;font-weight:700;fill:#edf4ef}svg .diagram-small{font-size:11px;fill:#9aa8b4}svg .diagram-wire{fill:none;stroke:#556577;stroke-width:3;stroke-linecap:round}svg .diagram-wire.active{stroke:var(--mint);stroke-width:4}svg .diagram-wire.blame{stroke:var(--violet);stroke-width:4}svg .diagram-node{fill:#19222c;stroke:#5a6875;stroke-width:1.5}svg .diagram-node.active{fill:#1e3a31;stroke:var(--mint)}svg .diagram-node.blame{fill:#34283f;stroke:var(--violet)}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
@media(max-width:1100px){.wrap{padding-inline:30px}.hero{grid-template-columns:1fr 1fr;gap:35px}.hero h1{font-size:clamp(3.5rem,5.5vw,5rem)}.hero-chain{gap:4px}.chain-item{min-width:92px;padding:10px}.content-layout{grid-template-columns:130px minmax(0,1fr);gap:35px}.lab-grid{grid-template-columns:minmax(0,1.25fr) minmax(180px,.8fr)}.handoff{gap:5px}.handoff-cell{padding:12px 8px}.handoff-cell strong{font-size:27px}}
@media(max-width:800px){.hero{display:block;min-height:0;padding-block:70px}.hero-copy{max-width:700px}.hero-visual{margin-top:47px;max-width:600px}.journey{padding-block:50px 70px}.journey-list{grid-template-columns:repeat(2,1fr)}.journey-list li:last-child:nth-child(odd){grid-column:span 2}.journey-list a{height:145px}.content-layout{display:block}.side-rail{display:none}.chapter{padding-block:66px 77px}.chapter-head h2{font-size:clamp(2.5rem,6vw,4rem)}}
@media(max-width:600px){body{font-size:15px}.wrap{padding-inline:20px}.hero{padding-block:57px 65px}.hero h1{font-size:clamp(3.2rem,11vw,4.7rem);margin-bottom:20px}.hero-lead{font-size:17px}.hero-note{font-size:13px}.hero-visual{min-height:290px}.hero-visual-top,.hero-visual-bottom{padding:14px;font-size:9px}.hero-chain{padding:30px 9px;gap:3px}.chain-item{min-width:0;flex:1;min-height:106px;padding:9px}.chain-item strong{font-size:21px}.chain-item .unit{font-size:9px}.chain-count,.chain-item small{font-size:8px}.chain-arrow{font-size:14px}.journey-intro{display:block}.journey-intro p{margin-top:15px}.journey-list{gap:7px}.journey-list a{height:135px;padding:13px}.journey-list strong{font-size:16px}.journey-list small{font-size:11px}.chapter-head h2,.recap h2{font-size:clamp(2.4rem,9vw,3.4rem)}.chapter-head>p{font-size:17px}.film-frame{margin-bottom:29px}.film-frame figcaption{font-size:9px}.prose{display:block;margin-bottom:32px}.prose p{font-size:15px;margin-bottom:15px}.lab{padding:17px}.lab-heading{display:block}.lab-heading h3{font-size:1.45rem}.lab-heading p{margin-top:9px}.lab-grid{display:block}.readout{margin-top:10px}.readout-main strong{font-size:42px}.readout-rows{max-width:330px}.handoff{display:grid;grid-template-columns:1fr 18px 1.2fr;gap:6px}.handoff-cell{min-height:105px}.handoff-arrow:nth-of-type(4){display:none}.handoff .handoff-highlight{grid-column:1}.handoff .handoff-highlight+.handoff-arrow{grid-column:2}.handoff .handoff-highlight+.handoff-arrow+.handoff-cell{grid-column:3}.handoff-double strong{font-size:22px}.network-diagram{min-height:0}.network-diagram svg{display:none}.network-mobile-flow{display:flex;flex-direction:column;align-items:stretch;padding:18px;gap:7px}.mobile-flow-card{border:1px solid #7d7194;border-radius:7px;background:#2a2635;min-height:66px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;gap:10px}.mobile-flow-card span{font-size:10px;letter-spacing:.09em;color:var(--body);font-weight:700}.mobile-flow-card strong{font-size:22px;color:var(--body);white-space:nowrap}.mobile-flow-arrow{align-self:center;color:var(--violet);line-height:1}.network-caption{display:block}.network-caption p{margin-top:5px}.lesson-intro{font-size:9px;letter-spacing:.05em}.lesson-pagination{grid-template-columns:1fr}.lesson-pagination a:last-child{text-align:left}.recap-grid{display:block}.recap-grid>div+div{margin-top:10px}.site-footer{display:block}.site-footer>p{text-align:left;margin-top:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
@media(max-width:600px){.lesson-goal{margin:-6px 0 24px;font-size:13px}.lesson-story{margin-bottom:32px}.lesson-story section{margin-bottom:27px}.lesson-story h3{font-size:1.4rem}.lesson-story p{font-size:15px;line-height:1.72}.worked-example{padding:18px 16px;margin:0 0 29px}.worked-example h4{font-size:18px}.trace-row{grid-template-columns:1fr auto;gap:3px 8px;padding:12px 0}.trace-row code{grid-column:1/-1;grid-row:2;font-size:12px}.trace-row strong{grid-column:2;grid-row:1;font-size:11px}.self-check{padding-inline:16px}.self-check summary{font-size:13px}}
/* Compact course opening: the lesson list should appear in the first viewport. */
html{scroll-padding-top:24px}.hero{min-height:0;gap:45px;padding-block:38px 36px}.hero h1{font-size:clamp(2.4rem,3.4vw,3.4rem);line-height:1.1;max-width:590px;margin-bottom:14px}.eyebrow{margin-bottom:14px}.hero-lead{font-size:16px;line-height:1.5;margin-bottom:9px}.hero-note{font-size:12px;line-height:1.5;margin-bottom:0}.hero-actions{margin-top:18px}.hero-visual{min-height:244px}.hero-visual-top,.hero-visual-bottom{padding:11px 16px}.hero-chain{padding:12px 16px}.chain-item{min-height:105px}.journey{padding-block:30px 64px}.journey-intro{margin-bottom:22px}.journey h2{font-size:clamp(1.9rem,2.75vw,2.7rem);margin-top:7px}.journey-list a{height:155px}.lesson-intro{padding-top:21px;padding-bottom:11px}.lesson-intro+.content-layout .chapter{padding-top:22px}.chapter-head h2{font-size:clamp(2.1rem,3.3vw,3.25rem);margin:11px 0 16px}.chapter-head>p{font-size:17px;margin-bottom:28px}.lesson-goal{margin:-10px 0 22px}.chapter,.recap{scroll-margin-top:24px}
.concepts{max-width:810px;margin:30px 0 27px;padding-top:25px;border-top:1px solid var(--line)}.concepts h3{font-size:1.65rem;margin:7px 0 17px;letter-spacing:-.035em}.concepts dl{margin:0}.concepts dl>div{display:grid;grid-template-columns:minmax(130px,.9fr) minmax(0,2.6fr);gap:20px;border-top:1px solid var(--line-soft);padding:12px 0}.concepts dt{color:var(--text);font-size:14px;font-weight:700;line-height:1.45}.concepts dd{color:var(--muted);font-size:13px;line-height:1.65;margin:0}
@media(max-width:800px){.hero{padding-block:35px 33px}.hero-visual{display:none}.hero h1{font-size:clamp(2.4rem,6vw,3.3rem)}.journey{padding-block:28px 54px}.journey-intro{margin-bottom:18px}}
@media(max-width:600px){.hero{padding-block:27px 30px}.hero h1{font-size:clamp(2.1rem,9vw,2.45rem);margin-bottom:12px}.hero-lead{font-size:15px}.hero-note{font-size:12px}.hero-actions{margin-top:16px}.journey{padding-block:24px 44px}.journey h2{font-size:2rem}.chapter-head h2{font-size:clamp(2.1rem,8.5vw,2.55rem)}.chapter-head>p{font-size:16px}.concepts{margin-top:25px}.concepts h3{font-size:1.5rem}.concepts dl>div{display:block;padding:12px 0}.concepts dt{margin-bottom:3px}}